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John George was born on 18 May 1777 at Ferox Hall, Tunbridge Kent. His father George Children, a lawyer, belonged to a family that lived at the home, "Childrens", near Nether Street in Hildenborough and his mother Susanna, who was the daughter of Rev. Thomas Marshall Jordan of West Farleigh died six days after he was born.[1]

He was a friend of Sir Humphry Davy and together they conducted several experiments. In 1808 he visited Spain where he met Joseph Blanco White. In 1813 he constructed a large galvanic cell and conducted experiments using them. These were published in Philosophical Transactions in 1815 and for this he received the Royal Institution medal in 1828. In 1824 he discovered a method of extracting silver without the need for mercury which was purchased by several American mining companies. He married Caroline, daughter of George Furlong Wise of Woolston, in 1809 but she died the next year. In 1819 he married Mrs. Towers (died 1839).[1]

In 1822 he was working as a librarian in the Department of Antiquities at the British Museum when he was appointed assistant keeper of the Natural History Department in succession to William Elford Leach. The appointment, influenced by Sir Humphry Davy, was controversial as he was less qualified than another applicant, William John Swainson. Children found himself poorly qualified in zoology and depended greatly on John Edward Gray who worked as a day-worker. Gray's own application to the post that Children held had been passed over due to rivalries with influential members of the Linnean Society. Some visitors to the British Museum like Edward Blyth found him uncooperative.[3] After the division of the Department into three sections in 1837 he became keeper of the Department of Zoology, retiring in 1840 and succeeded by his assistant John Edward Gray. After his retirement he took an interest in astronomy.[1][4]

His only daughter (from his first wife Hester Anna) was Anna Atkins, a botanist, who is best known for her book of cyanotypephotograms of algae, the first book of exclusively photographic images ever made. She wrote a memoir on the life of her father which included several unpublished poems.[5]